Unknown > Like Rohks

The back story to these is that I found them at a yard sale in a barn, they were bagged up randomly but it seems that majority of the white backs came mixed in with the purple rohks which I have a ton of, almost as many as the white backs. There were also these tiny slime green containers for the caps which hold about 15-16 pieces that contained some plastic rohks and white backs, since they are the same size, I assume they are potentially of the same brand. It would make sense then that they aren't branded if the plastic ones say patent pending.